Server and client side of sending an e-mail with SMTP protocol

I want to write both client and server sides of sending an e-mail also I should attend to the standard format of SMTP protocol which is speci开发者_如何学Pythonfied in RFC 821.

Would you please help and guide me that how can I start it?

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Why would you reinvent the wheel? There are many implementations for both sides that do a very good job and are well tested.

What feature do you miss in let's say Postfix (server) and Outlook (client)?

If you still want to start, ask yourself

• how to create TCP Sockets and read/write to them
• how to do connection and thread pooling
• how to implement a state machine
• what are you doing with related topics? (SPF, DKIM, mbox storage, Maildir storage)
• what are you going to use for user authentication and authorization
• (... enter hundreds of other things here ...)